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Mathematics
Mathematics
Problem
The quadratic equation
3
x
2
+
2
p
x
+
7
=
0
3x^{2}+2px+7=0
3
x
2
+
2
p
x
+
7
=
0
will have real roots if a)
p
2
≤
21
p^{2}\le 21
p
2
≤
21
b)
p
2
=
21
p^{2}=21
p
2
=
21
c)
p
2
≥
21
p^{2}\ge 21
p
2
≥
21
d)
p
≥
21
p\ge \sqrt{21}
p
≥
21
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